Thanks, Bert. It seems I got these NAs because I already had MSA population
controlled for in my model, besides the fixed effect variable, which led to
overestimation. Those NAs disappeared after I dropped the population
variable.
Gary
On Sun, Dec 1, 2013 at 10:27 AM, Bert Gunter wrote:
> You
You may wish to talk to a local statistician or read up on linear
models, as you appear to not understand some basics. Anyway, either
1. You have other covariates in your model that you haven't shown and
your model is overdetermined.
2. You have NA's in your data that causes 1) to occur.
As an e
Dear R users,
I am running a linear regression in R. My observations are Census Tracts in
several metropolitan areas (MSAs). In my data set, each MSA has at least 50
observations. I use factor(msa_code) in the lm formula to control for
metropolitan fixed effects. But I kept getting something like
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